The first asteroid we discussed was 2004 YD5. It is roughly 5 meters
(16 feet) across, and passed just about 20,000 miles away on
December 19, 2004. It was actually discovered after it had
already passed! This is common, actually, if the asteroid comes from
the general direction of the Sun. When it's in that area, it's
only up during the day (of course!) and cannot be detected until it
passes us. For more info about 2004 YD5 (including a cool
orbit simulator), go to NASA's
Near Earth Object web site.

The second asteroid we talked about was 2004 VW14. It's much larger
than YD5, with a diameter of something like 400-800 meters (it's hard to tell
these things any better than that sometimes). On December 24, it'll
pass the Earth with a larger margin, though, at about 5 times
the distance to the Moon (1.3 million miles, or 2 million kilometers).
It'll be too faint to see without a good telescope, shining at
about magnitude 13, roughly 1/1000 the brightness of the
faintest star you can see with your unaided eye.
You can see the orbit of this asteroid at the
Near Earth Object web site as well.

I mentioned the Near Earth Asteroid Rendezvous (NEAR) mission as well,
which orbited the asteroid Eros and took amazing images.
Find out more at the
NEAR mission website.

Remember: the Universe is wonderful enough without having to make up nonsense
about it.